Imagine you have an existing application which isn’t based on WAMP
components – say, a REST or classical Web application using HTTP.

Now what if you just want to add some real-time features without
changing your existing app to use WAMP or migrate from synchronous,
blocking to asynchronous, non-blocking code? Or if you want to access
your existing HTTP services using WAMP?

This is where the HTTP bridge services of Crossbar can help. They
provide WAMP components which provide interoperability with existing
code by using HTTP.

The HTTP Bridge Webhook is a service
that parses incoming WebHook requests (e.g. from GitLab or GitHub)
and pushes all the arguments to a configured topic

The HTTP Bridge Publisher is a service that
allows clients to submit PubSub events via HTTP/POST requests.
Crossbar will receive the event data via the request and forward the
event via standard WAMP to any connected subscribers in real-time.

The HTTP Bridge Caller is a service that allows
clients to perform WAMP calls via HTTP/POST requests. Crossbar will
forward the call to the performing server and return the result.